\begin{tabular}{|r||r@{}l|r|r@{ / }r|}\hline\hline
\mc{6}{|c|}{Average Benefit of Treatment}\\\hline\hline
Population & \mc{2}{c|}{Estimand} & p-value & \mc{2}{c|}{90\% Confi.}\\\hline
\mc{1}{|l||}{ Full } &           0.062 & $^{**}$ &            0.01 &           0.023 &           0.143 \\
\mc{1}{|l||}{ Treated } &           0.077 & $^{***}$ &            0.01 &           0.027 &           0.145 \\
\mc{1}{|l||}{ Untreated } &           0.048 & $^{**}$ &            0.01 &           0.019 &           0.141 \\
\hline\hline
